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Washington University Experience | NEOPLASMS (METASTASES) | Microscopic | 69B Metastasis, lung squamous (Case 69) CK5-6.jpg
The tumor cells are positive for CK5/6. ---- Not shown: The tumor is immunoreactive for p63 and focally for CK7. They are negative for TTF-1. The overall findings are consistent with a poorly differentiated squamous cell carcinoma, keratinizing type.
